Dynamics in nonlocal linear models in the Friedmann-Robertson-Walker metric

TL;DR

This paper investigates nonlocal scalar field cosmological models inspired by string theory, providing an exact solution that describes a universe with phantom dark energy and monotonic expansion.

Contribution

It introduces an exact solution to nonlocal Friedmann equations, demonstrating the equivalence to infinite local models and exploring phantom dark energy in this context.

Findings

Exact special solution for nonlocal Friedmann equations

Universe exhibits monotonic expansion with phantom dark energy

Establishes equivalence between nonlocal and infinite local models

Abstract

A general class of cosmological models driven by a nonlocal scalar field inspired by the string field theory is studied. Using the fact that the considering linear nonlocal model is equivalent to an infinite number of local models we have found an exact special solution of the nonlocal Friedmann equations. This solution describes a monotonically increasing Universe with the phantom dark energy.